JP3064811B2 - Moving speed estimation device in mobile communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving speed estimating apparatus in a mobile communication system for estimating the moving speed of a mobile unit based on a time-division multiplexed received signal, and more particularly to a base station and a portable telephone which communicate with each other. The present invention relates to a moving speed estimating device in a mobile communication system which is provided in both or one of the mobile stations and obtains the moving speed of the mobile station by estimating the relative moving speed of both stations based on received radio waves.

[0002] In recent years, demand for mobile communication systems has increased, and inevitably many radio frequencies have been required.
However, there are limits to the radio frequencies that can be used. Therefore, introduction of dynamic channel allocation control and the like is being studied in order to effectively use the radio frequency. In the dynamic channel assignment control, it is pointed out that the moving speed information of the call plays an important role, and it is necessary to obtain the moving speed of the call, that is, the moving speed of the mobile station.

[0003]

2. Description of the Related Art Conventionally, as a moving speed estimating device in a mobile communication system, for example, a "moving speed detecting device in a mobile communication system" (International Application No. PC
T-JP93-01714). In this device, first, as shown in FIG.
Detects the reception level of the reception signal,
02 samples the output of the level detection means 101 at each time interval T. The sampled reception level is sent to the difference detection unit 104 and also sent to the storage unit 103, and the storage unit 103 updates the storage content after a short time each time a new reception level is sent. The difference detection means 104 calculates the reception level sampled this time,
The difference from the reception level of the previous sampling stored in the storage unit 103 is obtained for each sampling. Comparison means 105
Compares the difference with a threshold value, and causes the counting means 106 to perform an up-count when the difference is larger than the threshold value. Counting means 10
6 performs this counting over a predetermined time,
07 converts the count value into a moving speed based on the count value. The conversion means 107 experimentally obtains and stores in advance a correlation table between the count value and the moving speed, and performs conversion by referring to the table.

[0004] In this correlation table, first, there is a correlation between the fading frequency f _d of the count value and the received signal is counted by the counting means 106 also increases the count value when fading frequency f _d becomes larger There is a property that. This situation is shown in FIG. 16 and FIG.

[0005] Figure 16 shows a reception level when fading frequency f _d is large, FIG. 17 shows a reception level when fading frequency f _d is small, ○ marks in the figure, the current and previous reception level Is a threshold (for example, 3d
B) shows the difference when exceeding. As seen from these figures, when fading frequency f _d is large, many times the difference exceeds the threshold value (8 times), the fading frequency f _d is small, decreases the number of times (4
Times) tendency. Focusing on this point, it becomes possible to accurately estimate the fading frequency f _d by somewhat prolonged time for obtaining the number of times.

[0006] Then, relation represented by the following formula between the moving velocity v and the fading frequency f _d of the mobile station. v = _fd × λ (λ is the wavelength of the received signal) Therefore, there is a correlation between the count value counted by the counting means 106 and the moving speed v of the mobile station. The relationship between the two can be determined in advance by an experiment.

[0007]

In a mobile communication system, time division multiplexing (TDMA) is often employed in order to improve transmission efficiency. At the receiver,
There is a receiver that does not perform a reception operation to save battery power and the like except for the time allocated to the own station. In such a receiver, if sampling is performed at a free-running timing that is not synchronized with the reception signal, the reception level is sampled in a time slot other than the time slot for the own station, and the difference is determined based on those reception levels. May be calculated. Since it is meaningless to detect the moving speed by using the reception level of a signal not received by the own station, the mobile station receiver that receives the time-division multiplexed signal has a time for the own station. There is a need to sample the reception level in the slot.

The difference detecting means 104 shown in FIG.
Comparison means 105, counting means 106, and conversion means 10
The speed estimation process performed in step 7 is performed independently of the dedicated CPU.
The processing can be performed by another general-purpose CPU that performs reception data processing and the like. As a result, the processing circuits can be generalized and shared, and the size and cost of the device can be reduced.

However, when a general-purpose CPU is shared, if speed estimation processing (calculation, comparison, counting, and conversion of a difference) is performed immediately after the current sampling, the sampling is performed immediately after the current sampling. Is a time when the general-purpose CPU is busy with the reception data processing, and it may be difficult to perform such speed estimation processing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and a moving speed estimating apparatus for a mobile communication system in which a reception level is sampled in a time slot for a self-station of a time division multiplexed signal. The first object is to provide

Further, the present invention provides a moving speed estimating apparatus in a mobile communication system in which the speed estimating process does not overlap with the reception data process in time so that the processing capability of the processor is effectively used. As a second object.

[0012]

According to the present invention, in order to achieve the first object, as shown in FIG. 1, a reception level detecting means 1 for detecting a reception level and a synchronization word in a reception signal are used. Reception slot timing detection means 2 for detecting and detecting the reception slot timing assigned to the own station
A timing generating means 3 for generating first and second sample timings at predetermined timings in a receiving slot allocated to the own station based on the detected receiving slot timing, and a receiving level detecting means 1 A storage unit for sampling and storing the detected reception level at a first sample timing; and a storage unit for sampling the reception level detected by the reception level detection unit at a second sample timing and storing the sampled reception level and the storage unit. 4, a difference calculating means 5 for calculating a difference from the reception level stored in the memory 4, a speed converting means 6 for calculating a relative moving speed between the own station and the other station based on the difference calculated by the difference calculating means 5, A moving speed estimating apparatus in a mobile communication system, comprising:

In order to achieve the first and second objects, as shown in FIG. 2, a reception level detection means 7 for detecting a reception level and a synchronization word in a reception signal for detecting a synchronization word are used. A receiving slot timing detecting means for detecting a receiving slot timing assigned to the station; a first and a second receiving slot timing detecting means for detecting the first and second timings based on the detected receiving slot timing; Generating a sample timing and a third timing located after the first and second sample timings;
, A first storage means 10 for sampling and storing the reception level detected by the reception level detection means 7 at a first sample timing, and a reception level detected by the reception level detection means 7. The second storage means 11 samples and stores the level at the second sampling timing, and the reception level stored in the first storage means 10 and the level stored in the second storage means 11 at the third timing. Difference calculating means 12 for calculating a difference from the reception level, and speed converting means 1 for calculating a relative moving speed between the own station and the other station based on the difference calculated by the difference calculating means 12.
3. A moving speed estimating apparatus in a mobile communication system, comprising:

[0014]

In the configuration shown in FIG. 1, the receiving slot timing detecting means 2 detects the synchronization word in the received signal to detect the receiving slot timing allocated to the own station, and the timing generating means 3 determines the receiving slot timing. Based on the timing, first and second sample timings are generated at predetermined timings in a reception slot allocated to the own station.

First, the storage means 4 samples and stores the reception level detected by the reception level detection means 1 at a first sampling timing. Next, the difference calculation means 5 samples the reception level detected by the reception level detection means 1 at the second sampling timing, and calculates the difference between the sampled reception level and the reception level stored in the storage means 4. I do. As described above, the reception levels used for calculating the difference are all detected in the reception slots allocated to the own station.

Finally, the speed conversion means 6 calculates the relative moving speed between the own station and the other station based on the difference. In the configuration shown in FIG. 2, the receiving slot timing detecting means 8 detects the synchronization word in the received signal to detect the receiving slot timing allocated to the own station, and the timing generating means 9 outputs the detected receiving slot timing. Based on the slot timing, the first and second sample timings are generated at each predetermined timing in the reception slot allocated to the own station, and the third and third sample timings located after the first and second sample timings are generated. Generate timing.
The first storage means 10 samples and stores the reception level detected by the reception level detection means 7 at a first sampling timing, and the second storage means 11 stores the reception level detected by the reception level detection means 7. It is sampled and stored at the second sample timing. Each of these stored reception levels is detected in a reception slot allocated to the own station.

Next, the difference calculating means 12 calculates the difference between the reception level stored in the first storage means 10 and the reception level stored in the second storage means 11 at a third timing. By appropriately selecting the third timing, the speed estimation processing can be prevented from overlapping with the reception data processing in terms of time.

Finally, based on the difference calculated by the difference calculating means 12, the speed converting means 13 calculates a relative moving speed between the own station and the other station.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a block diagram showing a configuration of a first embodiment of a moving speed estimation device applied to a mobile communication system that transmits and receives time-division multiplexed signals. The first embodiment achieves the above-described first and second objects of the present invention.

In FIG. 1, a level detector 21 detects a reception level of a reception signal, and a sampling unit 22 samples the detected reception level. The sampling section 22 is formed of an A / D converter, and the cycle of this sampling is sufficiently shorter than the cycle of a timing signal output by the timing generation section 24 described later.

The synchronization detector 23 demodulates the received signal, detects a synchronization word of a time slot allocated to the own station from the demodulated received data, and generates a reference timing for starting reception. . The reference timing detected by the synchronization detection unit 23 is used by a timing generation unit 24 described later, and a reception device (not shown) is operated only during a time slot allocated to the own station.
During other times, it is also used for power control to save battery power.

The timing generation unit 24 includes a synchronization detection unit 23
, The first and second sample timing signals t1 and t2 and the third sample timing signal t1 and t2 at each predetermined timing in the reception slot allocated to the own station.
Is generated. The first sample timing signal t1 is generated after a lapse of time To from the reference timing, and the second sample timing signal t2
Is generated after a lapse of time T from the timing at which the first sample timing signal t1 was generated. Time To
The time T is set such that the first and second sample timing signals t1 and t2 occur in the reception slot allocated to the own station. The third timing signal t3 is the first and second sample timing signals t
It is set so as to be generated after 1, 1 and at the timing when the reception data processing is completed.

FIG. 4 shows such timing signals. FIG. 4 shows a timing chart in the first embodiment,
The hatched portions in the figure are reception slots allocated to the own station. The length of the reception slot is Tr, and the length of one frame of the reception data is Ts.

Returning to FIG. 3, the first sample timing signal t1 is sent to the storage unit 25, and the second sample timing signal t2 is sent to the storage unit 26. Storage unit 25, 2
6, the sampled reception level is sent from the sampling unit 22. The storage unit 25 stores the reception level from the sampling unit 22 every time the first sample timing signal t1 is input. The storage unit 26 stores the reception level every time the second sample timing signal t2 is input. Is stored.

Each time the third timing signal t3 is input, the difference detection section 27 obtains a difference between the reception level stored in the storage section 25 and the reception level stored in the storage section 26. The comparing unit 28 compares this difference with a threshold value (for example, 3 dB), and causes the counting unit 29 to perform an up-count when the difference is larger than the threshold value. The counting section 29 performs this counting for a predetermined time (for example, 1 second), and the conversion section 30 converts the count value into a moving speed based on the count value. The operation of the speed estimation process from the difference detection unit 27 to the conversion unit 30 is the same as that of the conventional device.

As described above, since the synchronization detection unit 23 and the timing generation unit 24 are provided and the reception level is sampled in the reception slot allocated to the own station, the time other than the time slot for the own station is used. Sampling of the reception level in the slot can be avoided. Further, after the input of the third timing signal t3, the processing of calculating, comparing, counting, and converting the difference of the reception level is performed, so that the processing does not overlap with the reception data processing in time. This is effective when performing these processes collectively.

FIG. 5 shows a reception level when the fading frequency f _d is large in the first embodiment.
FIG. 7 shows the reception level when the fading frequency f _d in the first embodiment is small. The circles in the figure indicate the case where the difference between the reception levels exceeds the threshold. In each case, two points are measured in the own-station receiving slot, and in FIG. 5 where the fading frequency f _d is large, a difference equal to or larger than the threshold is detected twice. On the other hand, the fading frequency f _d
In the case where is small, no difference equal to or larger than the threshold value is detected.

Next, a second embodiment of the present invention will be described. The second embodiment also achieves the above-described first and second objects of the present invention. FIG. 7 is a block diagram showing a configuration of a second embodiment of the moving speed estimating apparatus applied to a mobile communication system that transmits and receives time-division multiplexed signals. The configuration of the second embodiment is basically the same as that of the first embodiment, except that the difference detection unit 27 to the conversion unit 30 of the first embodiment are different from the CPU 31 in the second embodiment. The difference is that it is housed inside. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

The CPU 31 is a general-purpose CPU for performing reception processing. In the second embodiment, the CPU 31 is also used for speed estimation processing. The CPU 31 is connected to a storage unit 32 including a ROM for storing a threshold value and the like, and receives a timing signal T3 from the timing generation unit 24. The speed estimation process by the CPU 31 will be described with reference to FIG.

FIG. 8 is a flowchart showing the procedure of the speed estimation processing by the CPU 31. Hereinafter, description will be made along the steps in the figure. [S1] A counter for counting the number of differences exceeding the threshold value is set to 0 and initialized.

[S2] A timer for measuring a period for counting the number of differences exceeding the threshold is set to 0 and initialized. [S3] Wait for the input of the timing signal T3, and when it is input, proceed to step S4.

[S4] The difference between the reception level stored in the storage unit 25 and the reception level stored in the storage unit 26 is determined. [S5] The difference is compared with a threshold value, and when the difference is larger than the threshold value, the process proceeds to step S6.
Proceed to 7.

[S6] The counter is incremented by one. [S7] The timer is incremented by one. [S8] The timer value is compared with a predetermined measurement time. If the timer value is smaller than the predetermined measurement time, the process returns to step S3, and if the timer value reaches the predetermined measurement time, the process proceeds to step S9.

[S9] A correlation table between the count value and the moving speed is experimentally obtained and stored in advance, and the counter value is converted into the moving speed with reference to the table. Instead of using the correlation table, a mathematical expression for conversion may be used.

As described above, in the second embodiment in which the general-purpose CPU that performs the receiving process is also used for the speed estimation process, the processing circuit can be generalized and shared, and the apparatus can be reduced in size and cost. Further, since the speed estimation processing can be performed so as not to overlap after the reception processing, the processing capacity of the CPU can be used effectively.

Next, a third embodiment of the present invention will be described. The third embodiment achieves the first object of the present invention described above. FIG. 9 is a block diagram illustrating a configuration of a third embodiment of the moving speed estimation device applied to the mobile communication system that transmits and receives the time-division multiplexed signal. Since the configuration of the third embodiment is basically the same as the configuration of the first embodiment, the same reference numerals in the third embodiment denote the same parts as in the configuration of the first embodiment. The description is omitted.

In the third embodiment, the timing generator 35
Based on the reference timing output from the synchronization detection unit 23, the first
Similarly to the embodiment, the first and second sample timing signals t1 and t2 are generated at each predetermined timing in the reception slot allocated to the own station, but the third timing signal t3 is not generated. The first sample timing signal t1 is sent to the storage unit 36, and the second sample timing signal t2 is sent to the difference detection unit 37. Storage unit 36
Stores the reception level from the sampling unit 22 every time the first sample timing signal t1 is input. Each time the second sample timing signal t2 is input, the difference detection unit 37 receives the reception level from the sampling unit 22, calculates a difference from the reception level stored in the storage unit 36, and Send to

Regarding the generation of the first and second sample timing signals t1 and t2 by the timing generation section 35,
As shown in FIGS. 10 to 12, there are three generation methods according to various settings of the time T.

FIG. 10 shows a case where the time T is slightly smaller than the time Tr, and the first and second sample timing signals t1 and t2 are transmitted within the same reception slot (shaded area) allocated to the own station. Only one set is generated.
In this case, the speed estimation processing is performed once for each reception slot allocated to the own station.

FIG. 11 shows a case where the time T is considerably shorter than the time Tr, and the first and second sample timing signals t and t are set within the same reception slot allocated to the own station.
In this case, a plurality of sets (1, 3 sets in FIG. 1) are generated.
In this case, the speed estimation process is performed a plurality of times (three times in the figure) corresponding to the same reception slot allocated to the own station. Sample timing signal generation method of FIG. 11 is effective when a large fading frequency f _d.

FIG. 12 shows a case where the time T is considerably longer than the time Tr, and the second sample timing signal t2
Is generated in the reception slot allocated to the own station in the frame next to the reception slot in which the first sample timing signal t1 was generated. In this case, the speed estimation processing is performed at the position of the reception slot assigned to the own station in the frame next to the reception slot assigned to the own station, and is executed once for each reception slot assigned to the own station. Will be The method of generating a sample timing signal shown in FIG. 12 is effective when the fading frequency f _d is small.

Next, a fourth embodiment of the present invention will be described. The fourth embodiment achieves the first and second objects of the present invention. FIG. 13 is a block diagram illustrating a configuration of a fourth embodiment of the moving speed estimation device applied to the mobile communication system that transmits and receives time-division multiplexed signals. Since the configuration of the fourth embodiment is basically the same as the configuration of the first embodiment, the same reference numerals in the fourth embodiment denote the same parts as in the configuration of the first embodiment. The description is omitted.

In the fourth embodiment, the timing generator 41
Generates the first and second sample timing signals t1 and t2 and the third timing signal t3 as in the first embodiment, but stores the first and second sample timing signals t1 and t2. The second sample timing signal t2 is sent to the storage unit 43. The third timing signal t3 is sent to the difference detector 44. The storage unit 42 stores the reception level from the sampling unit 22 each time the first sample timing signal t1 is input, and stores the reception level each time the second sample timing signal t2 is input. After transferring the received reception level to the storage unit 43, the reception level from the sampling unit 22 is stored. The storage unit 43 stores the reception level transferred from the storage unit 42 every time the second sample timing signal t2 is input. Each time the third timing signal t3 is input, the difference detection unit 44
The difference between the reception level stored in the storage unit 43 and the reception level stored in the storage unit 43 is determined.

At the time when the third timing signal t3 is generated, the reception level based on the second sample timing signal t2 is always stored in the storage section 42, and the reception level based on the first sample timing signal t1 is stored in the storage section 43. The level is memorized. Therefore, the difference detection unit 44 calculates the difference between the respective reception levels based on the first and second sample timing signals t1 and t2.

Next, a fifth embodiment of the present invention will be described. The fifth embodiment achieves the above-described first and second objects of the present invention. FIG. 14 is a block diagram illustrating a configuration of a fifth embodiment of the moving speed estimation device applied to the mobile communication system that transmits and receives time-division multiplexed signals. Since the configuration of the fourth embodiment is basically the same as the configuration of the first embodiment, the same reference numerals in the fifth embodiment denote the same parts as in the first embodiment. The description is omitted.

In the fifth embodiment, the timing generator 46
Generates the first and second sample timing signals t1 and t2, and the third timing signal t3 as in the first embodiment, but switches the first and second sample timing signals t1 and t2. 50, the first sample timing signal t1 is sent to the storage unit 47, and the second sample timing signal t2 is sent to the storage unit 48. Third
Is sent to the difference detection section 49. The switch 50 connects to the storage unit 47 when the first sample timing signal t1 is input and sends the input signal to the storage unit 47, and connects to the storage unit 48 when the second sample timing signal t2 is input. And sends the input signal to the storage unit 48. The storage unit 47 stores the first sample timing signal t1
The storage unit 48 stores the reception level sent from the switch 50 each time the second sample timing signal t2 is input. Each time the third timing signal t3 is input, the difference detection unit 49 obtains a difference between the reception level stored in the storage unit 47 and the reception level stored in the storage unit 48.

When the first sample timing signal t1 is input, the switch 50 is connected to the storage unit 47, so that the storage unit 47 stores the first sample timing signal t1.
When the second sample timing signal t2 is input and the switch 50 is connected to the storage unit 48, the storage unit 48 sets the reception level based on the second sample timing signal t2. Remember. Therefore, the difference detection unit 44 calculates the difference between the respective reception levels based on the first and second sample timing signals t1 and t2.

In the fourth and fifth embodiments, the third timing signal t3 is supplied to the difference detection unit 44 and the difference detection unit 48. Alternatively, the second sample timing signal t2 may be supplied to the difference detection unit 49 to perform the speed estimation immediately after the input of the second sample timing signal t2. However, in this case, only the first object of the present invention can be achieved.

In the third to fifth embodiments, the components from the difference detection unit to the conversion unit may be constituted by general-purpose CPUs as in the second embodiment.

[0050]

As described above, according to the present invention, the synchronization detection section and the timing generation section are provided, and the sampling of the reception level is performed in the reception slot allocated to the own station. Sampling of the reception level in a time slot other than the slot can be avoided.

Further, since the speed estimation process is performed after the input of the third timing signal, the speed estimation process does not overlap with the reception data process, so that it is effective when the reception process and the speed estimation process are collectively performed by the general-purpose CPU. .

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first principle of the present invention.

FIG. 2 is a diagram illustrating a second principle of the present invention.

FIG. 3 is a configuration diagram of a first embodiment.

FIG. 4 is a timing chart of the first embodiment.

FIG. 5 is a diagram illustrating a reception level when a fading frequency is large.

FIG. 6 is a diagram illustrating a reception level when a fading frequency is small.

FIG. 7 is a configuration diagram of a second embodiment.

FIG. 8 is a flowchart of a speed estimation process according to the second embodiment.

FIG. 9 is a configuration diagram of a third embodiment.

FIG. 10 is a timing chart (1) of the third embodiment.

FIG. 11 is a timing chart (2) of the third embodiment.

FIG. 12 is a timing chart (3) of the third embodiment.

FIG. 13 is a configuration diagram of a fourth embodiment.

FIG. 14 is a configuration diagram of a fifth embodiment.

FIG. 15 is a block diagram of a conventional moving speed detecting device.

FIG. 16 is a diagram illustrating a reception level when a fading frequency is large.

FIG. 17 is a diagram illustrating a reception level when a fading frequency is small.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 reception level detection means 2 reception slot timing detection means 3 timing generation means 4 storage means 5 difference calculation means 6 speed conversion means 7 reception level detection means 8 reception slot timing detection means 9 timing generation means 10 first storage means 11 second Storage means 12 difference calculation means 13 speed conversion means

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuo Obuchi 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Kenji Suda 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Fujitsu Limited (72) Inventor Teruhisa Kokatsu 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Co., Ltd. Fujitsu Co., Ltd. (1015) Uedanaka, Nakahara-ku, Kawasaki-shi, Japan (72) Inventor Tadao Takami 2-1-1, Toranomon, Minato-ku, Tokyo Inside NTT Mobile Communication Network Co., Ltd. (56) References JP Hei 7-235902 (JP, A) JP-A-5-14290 (JP, A) WO 94/19704 (WO, A1) (58) Field (Int.Cl. ^7, DB name) H04B 7/26 H04B 17/00 - 17/02 H04Q 7/00 - 7/38

Claims (7)

(57) [Claims] 1. A moving speed estimating apparatus in a mobile communication system for estimating a moving speed of a mobile unit based on a time-division multiplexed received signal, a receiving level detecting means for detecting a received level, and a synchronization word in the received signal. Receiving slot timing detecting means for detecting the receiving slot timing allocated to the own station, based on the detected receiving slot timing, at each predetermined timing in the receiving slot allocated to the own station. Timing generation means for generating first and second sample timings; storage means for sampling and storing the reception level detected by the reception level detection means at the first sample timing; and detection by the reception level detection means The reception level is sampled at the second sample timing, and Calculating means for calculating a difference between the received level and the received level stored in the storage means, and a speed for obtaining a relative moving speed between the own station and the other station based on the difference calculated by the difference calculating means. A moving speed estimating device in a mobile communication system, comprising: converting means. 2. The mobile communication system according to claim 1, wherein said timing generation means generates one set of said first and second sample timings in the same reception slot allocated to the own station. Moving speed estimation device. 3. The mobile communication system according to claim 1, wherein said timing generation means generates a plurality of sets of said first and second sample timings in the same reception slot allocated to the own station. Moving speed estimation device. 4. The timing generation means generates the second sample timing in a reception slot allocated to the own station in a frame next to a reception slot in which the first sample timing is generated. The moving speed estimating apparatus in the mobile communication system according to claim 1, wherein 5. A mobile speed estimating apparatus in a mobile communication system for estimating a mobile speed of a mobile unit based on a time-division multiplexed received signal, a receiving level detecting means for detecting a received level, and a synchronization word in the received signal. Receiving slot timing detecting means for detecting the receiving slot timing allocated to the own station, based on the detected receiving slot timing, at each predetermined timing in the receiving slot allocated to the own station. Timing generating means for generating first and second sample timings, and generating a third timing located after the first and second sample timings; and a receiving level detected by the receiving level detecting means. First storage means for sampling and storing at a first sample timing; A second storage unit that samples and stores the reception level detected by the vector detection unit at the second sample timing; and a reception level stored in the first storage unit at the third timing. A difference calculating means for calculating a difference from the reception level stored in the storage means, and a speed converting means for calculating a relative moving speed between the own station and the other station based on the difference calculated by the difference calculating means. A moving speed estimating device in a mobile communication system, comprising: 6. A mobile speed estimating apparatus in a mobile communication system for estimating a mobile speed of a mobile unit based on a time-division multiplexed received signal, a reception level detecting means for detecting a reception level, and a synchronization word in the received signal. Receiving slot timing detecting means for detecting the receiving slot timing allocated to the own station, based on the detected receiving slot timing, at each predetermined timing in the receiving slot allocated to the own station. Timing generating means for generating first and second sample timings, and generating a third timing located after the first and second sample timings; and a receiving level detected by the receiving level detecting means. First storage means for sampling and storing at the first and second sample timings; A second storage unit that writes the reception level stored in the first storage unit to the self at the second sample timing; and a reception level stored in the first storage unit at the third timing. Difference calculating means for calculating a difference from the reception level stored in the second storage means; and speed conversion for obtaining a relative moving speed between the own station and the other station based on the difference calculated by the difference calculating means. A moving speed estimating apparatus in a mobile communication system, comprising: 7. A moving speed estimating apparatus in a mobile communication system for estimating a moving speed of a mobile unit based on a time-division multiplexed received signal, a receiving level detecting means for detecting a receiving level, and a synchronization word in the received signal. Receiving slot timing detecting means for detecting the receiving slot timing allocated to the own station, based on the detected receiving slot timing, at each predetermined timing in the receiving slot allocated to the own station. Timing generation means for generating first and second sample timings and generating a third timing located after the first and second sample timings; and operating at the first and second sample timings hand,
The reception level detected by the reception level detecting means is 2
Switch means for outputting alternately to each of the two output terminals; first storage means connected to one output terminal of the switch means for storing a reception level sent from the switch means; and the other of the switch means A second storage means connected to the output end of the second storage means for storing the reception level sent from the switch means; and the reception timing stored in the first storage means and the second storage means at the third timing. A difference calculating means for calculating a difference from the reception level stored in the storage means, and a speed converting means for obtaining a relative moving speed between the own station and the partner station based on the difference calculated by the difference calculating means. A moving speed estimating device in a mobile communication system, comprising: